Bicarbonate(s) which exist (s) in solid from

Options

A. `NaHCO_(3)`
B. `KHCO_(3)`
C. `NH_(4)HCO_(3)`
D. `Ca(HCO_(3))_(2)`

Answer

To determine which bicarbonates exist in solid form, we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Bicarbonates:**
The question provides four bicarbonates:
- Sodium bicarbonate (NaHCO₃)
- Potassium bicarbonate (KHCO₃)
- Ammonium bicarbonate (NH₄HCO₃)
- Calcium bicarbonate (Ca(HCO₃)₂)

2. **Analyze Sodium Bicarbonate:**
Sodium bicarbonate, commonly known as baking soda, is a white solid at room temperature.
- **Conclusion:** Sodium bicarbonate exists in solid form.

3. **Analyze Potassium Bicarbonate:**
Potassium bicarbonate is also a white solid that is stable at room temperature.
- **Conclusion:** Potassium bicarbonate exists in solid form.

4. **Analyze Ammonium Bicarbonate:**
Ammonium bicarbonate is a white crystalline solid that is used in baking and as a leavening agent. It decomposes upon heating but is solid at room temperature.
- **Conclusion:** Ammonium bicarbonate exists in solid form.

5. **Analyze Calcium Bicarbonate:**
Calcium bicarbonate is unique because it does not exist as a solid. Instead, it exists in an aqueous solution and decomposes upon evaporation to form calcium carbonate (CaCO₃), carbon dioxide (CO₂), and water (H₂O).
- **Conclusion:** Calcium bicarbonate does not exist in solid form.

6. **Final Conclusion:**
The bicarbonates that exist in solid form are:
- Sodium bicarbonate (NaHCO₃)
- Potassium bicarbonate (KHCO₃)
- Ammonium bicarbonate (NH₄HCO₃)

### Answer:
The bicarbonates that exist in solid form are sodium bicarbonate, potassium bicarbonate, and ammonium bicarbonate.